Cobaltiferous azo-dyestuffs



Patented Mar. 23,, 1954 2,673,201, COBALTIFEROUS AZO-DYESTUFFS' Christian Zickendraht, Biuningen, and. Arthur Buehler, Rheinfelden, Switzerland, assignors to Ciba Limited, Basel, Switzerland, a Swissfirm No Drawing. Application August 11, 1952,

Serial No. 303,816"

Claims priority, application Switzerland August 13, 1951.

8 Claims.

According to this invention valuable new cobaltiferous azo-dyestufis are made by treating a m'onoazo-dyestufl free from sulfonic acid and carboxylic acid groups and corresponding to. the general formula in which R1 represents a benzeneradical bound to the azo-linkage in ortho-position relativelyto the hydroxyl group and free from sulfonic acid amide groups, and R2 represents-a, benzene radical containing a sulfonic acid amide group, with an agent yielding cobalt in such manner that the resulting cobaltiferous dyestuff contains less than one atom of cobalt in complex union per molecule of monoazo-dyestuif.

The monoazo-dyestufis of the above formula used as starting materials in the present process can be prepared by coupling an ortho-hydroxydiazo compound of the benzene series free from sulfonic acid, carboxylic acid and sulfonic acid amide groups with a pyrazolone of the formula on CNRz CH3 in which R2 has the meaning given above.

Such pyrazolones can be prepared by the, usual methods. As examples of such pyrazolones there may be mentioned; 1*phenyl-3-methy1-5-pyrazolone-2"-3'-or if sulfonic acid amide and the corresponding N -methyl-, N ethyl-, N-isopropyl-,.

N-n-butyl-, N-dimethyl:-, N-diethyl N-fi-hydroxyethyl-, N-phenyl-, N-ethylphenylor N -cyclohexyl-amide, and also 1-phenyl-3-methyl-5- pyrazolone-3- or -4'-sulfonic acid morpholide and l-pheny1-3 methyl-5-pyrazolone3'-sulfonic acid pyrrolidide, 1 Dhenyl pyrazolone-2'-methyl-5 -sulfonic acid amide, 1- phenyl 3 -methy1 5' pyrazolone -2' chloro 5'-sulfonic acid amide or l-phenyl-3-methyl-5- pyrazolone i-methyl-5"-sulfonic acid amide.

As ortho-hydroxy-diazo-compoundsof the benzene series there come into consideration for making the dyestufis used as startingmaterials in the present process, diazo-compounds of orthohydrox-y-amines- 'of thebenzeneseries of which the benzene nucleus may contain, in addition to the hydroxyl and amino groups, further substituents free from sulfur, such as halogen atoms (for example, chlorine), alkyl groups (for example, methyl), alkoxy groups (for example, methoxy), nitro groups, CO-alkyl groups (for example, -C0 CH3), and acylamino groups (for example, acetylamino). Especially valuable are 6 nitro-4-methyl or 4.--chloro-2-arnin0-lhydroxybenzene, 6-chloro-4-methylor -4-nitro- -amino-1-hydroxybenzene, 4'-nitro-, 4-methyl-, 4-chloro or 4-acetylamino-2 amino-l-hydroxybenzene, 5-nitro-2-amino-Lhydipxybenzene, 4- methylor 4-ch1oro-5-nitro-Z-amino-l-hydroxybenzene, 4 nitro 6 acetylamin o 2 amino 1 hydroxybenzene, 6 nitro 4 acetylamino 2 am no 1 hydroxybenzene, 4:6 dinitro 2 amino 1 hydroxybenzene, 4:6 dichloro 2 iamino- 1 hydroxybenz en'e, 3,4,6 trichloro 2 amino 1 hydroxybenzene, 4 methoxy 5 -chloro 2 amino 1 hydroxybenzene, 4 tertiary amyl 6 nitro. 2 amino 1 hydroxybenzene, 3 amino 4 hydroxyacetoe phenone, 5 nitro 3 amino 4 hydroxyacetophenone, 4 methoxy 2 amino l hydroxybenzene or 6-acetylaminol-chloro2-amino-l-hydroxybenzene, and also Z-amino-l-hydroxybenzene-4-carboxylic acid amide.

The coupling of the ortho-hydroxydiazo-compounds with the pyrazolones can be carried out by the usual known methods, for example in a weakly acid to alkaline medium.

After the coupling reaction is finished the dyestuffs, for the purpose of metallization, can easily be-separated from the coupling mixture by filtration, if desired, after the addition of sodium chloride. They are advantageously used for metallization in the form of filter cakes without intermediate drying. In somecases it is possible. to carry out the metallization directly in the coupling mixture without intermediate separation.:

The monoazoi-dyestufis serving as starting ma.- terials in the present process and obtainable as described above are. in part new. They are in general not especially easily soluble in water even in the form of their alkali compounds. However, someof them are sufiiciently soluble in that form for use in dyeing Wool from dyebaths which require no addition of acid.

The treatment with the agent yielding cobalt is carried out in the present invention in such manner that a cobaltiferous dyestufi" is obtained Whichcontains less than cne atom of cobalt in complex union per molecule of monoazo-dyestufi. Accordingly, the metallization is advantageously carried out with such agents yielding cobalt and by such methods as lead to the formation of complex cobalt compounds having that constitution.

It is generally desirable to use a quantity of the agent yielding cobalt which corresponds to less than one atomic proportion of cobalt for each molecular proportion of dyestuff and/or to conduct the metallization in a weakly acid to alkaline medium. Therefore, there are especially suitable for carrying out the process those agents yielding cobalt which are stable towards alkaline media, for example, cobalt compounds of aliphatic dicarboxylic acids or .ortho-hydroxy-carboxylic acids, which contain the cobalt in complex union. Simple compounds of divalent cobalt such as cobalt sulfate or cobalt acetate or, if desired, cobalt hydroxide can also be used with advantage.

The conversion of the dyestuffs into the complex cobalt compounds is advantageously carried out at a raised temperature, under atmospheric or superatmospheric pressure, and, if desired, in the presence of suitable additions, forexample, salts of organic acids, bases, organic solvents or other agents assisting the formation of complexes.

In a special form of the process a mixture of two different metallizable monoazo-dyestuffs is used as starting material, both of which dyestuffs correspond to the above Formula 1 or one of.

which corresponds to that formula and the other is an ortho ortho -dihydroxy-monoazo-dyestufl of the benzene-azo-naphthalene type.

As monoazo-dyestufis of the benzene-azonaphthalene type there come into consideration for the last-mentioned form of the process, more especially those of the fl-naphthol series, for ex- .4

ample, those obtainable from 2-hydroxynaphthalene, V 6-bromo-2-hydroxynaphthalene or 1- acylamino-l-hydroxy-naphthalenes and orthohydroxy-diazo-compounds of the benzene series such as diazotized 2-amino-l-hydroxybenzene sulfonic acid amides or the other diazo-compounds mentioned above.

In this form of the process also it will be understood that the treatment with the agent yielding cobalt is carried out in such manner that the resulting cobaltiferous dyestufi contains less than one atom of cobalt in complex union per molecule of monoazo-dyestuff.

The products of the inventionare new. They are cobalt compounds which contain two monoazo-dyestuifs in a complex in which the ratio of the number of cobalt atoms in complex union to the number of molecules of monoazo-dyestuffs bound in complex union to cobalt is smaller than 1:1, and is advantageously about 1:2, and in which the two monoazo-dyestuffs present are orthozortho dihydroxy monoazo dyestuffs free from sulfonic acid and carboxylic acid groups, one of which dyestuffs corresponds to the general Formula 1 and the other of which also corresponds to that formula or is of the benzeneazo-naphthalene type. Valuable are the cobalt compounds of this type which contain two monoazo-dyestuifs both of which correspond to the general Formula'l, but above all those which contain two monoazo-dyestufis of the same constitution.

The new cobaltiierous dyestuffs are soluble in water and in weakly acid aqueous media and are indeed more soluble than the cobalt-free-dyestuff from which they are made. They are suitable for dyeing or printing a very wide variety of materials, and principally for dyeing nitrogenous natural materials such as silk, leather and especially wool, but are also suitable for dyeing or printing synthetic fibers of superpolyamides or superpolyurethanes. They are suitable for dyeing from weakly alkaline, neutral or weakly acid baths, especially acetic acid baths. The wool dyeings so produced are distinguished by their level character, very good properties of wet fastness and very good fastness to light.

The following examples illustrate the invention, the parts and percentages being by weight.

Example 1 4.52 parts of the dyestuff from diazotized 4- nitro 6 chloro 2 amino 1 hydroxybenzene and 1-phenyl-3-methyl-5-pyrazolone-3'-sulfonic acid amide are dissolved in 150 parts of water and 2.6 parts of sodium hydroxide solution of 30 per cent. strength and, after the addition of 30 parts of a cobalt sulfate solution having a content of f cobalt of 1.05 per cent, the mixture is stirred for 30 minutes at 85 C. At the end of this period the formation of the complex is finished.

bath brownish yellow tints of good fastness to":

washing and light.

Similar dyestuffs are obtained by treating the.

monoazo-dyestuiis, obtained from the diazo-and coupling components given in columns I and II of the table below, in the manner described above with an agent yielding cobalt. The tints ofthe dyeings produced on wool with the complex co-- balt compounds are given in column, III.

I II III 1.-- 4-nitro-2-amino-l-hyl-plienyl-3-methyi-5- brownish droxybenzene. pyrazolone-3'-su1ionic yellow. I acid amide.

2 5-nitro-2-a1nino-l-hy- ..do ..'red-. I

droxybcnzene.

3 4-ch1oro-2-amino-l-hy- .do brownish droxybenzene. orange.

4 i-nitro-fi-chloro-2-aniinol-phenyl-3-methyl-5- Do.

l-hydroxybenzene. pyrazolone-3-su1ionic acid-N-methylaride.

5.-- do l-pnenyl-3-mcthyi-5 brownish pyrazolone3-sulfonic yellow. acid-N-B-hydroxycthylatnidc.

6... do l-phenyl-3-methyl-5- Do.

pyrazolone-3-sulfonic acid-N-phenylamide.

7 4:6-dichloro-2-amino-ll-plienyl-3-methyl-5- Do.

' hydroxybenzene. pyrazo1onc-4-sulionic acid amide.

8 do l-phcnyl-3-methyl-5- Do.

' pyrazolone-3-sulfonic acid amide.

Example 2 18.3 parts of the dyestuff, obtained from diazotized 5-nitro-2-amino-l-hydroxybenzene' and 1-acetylamino-'T-hydroxynaphthalene, and 19.6

parts of the dyestuif, obtained from diazotized 4 chloro 2 amino 1 hydroxybenzene and 1- y phenyl-3-methyl-5 -pyrazolone-3 -sulfonic acid amide are dissolved in 2000 parts of water .with

the addition of 15 parts of sodiumhydroxida i and mixed at 80 C. with parts of a solution of cobalt sulfate having a cobalt content of 3.25- per cent. After stirring for hour at 80" C. the metallization is finished. Upon -neutraliz a- -,t ion with' acetic acid the cobalt-complex sepa' rates. out ;while-.;the. m ixture isystill hot. :It -,is. it is adarkpowder;

4-nltro-6-chloro-2 -amlr o-, 1.-hydroxybenzene 'l-phenyl-3-methy1-5+ pyrazolone-W-sulfonic pyrazolone-y-sulfonic F ,acidamlde. .acid-N-phenylamido.

. do 4-:.itr0-6-chloro-2-amiuol-hydroxvbenzene l-pheny-l-3-methyk5- pytazolonc-3-sulfonic acid arride. do. Z-amino-l-hydroxybenzeuc-4-su1fonic acid amide Z-hydroxynaphthalene.

brownish orange.

bor-

. eaux.

Example 3 100 parts of well Wetted wool are entered at 40-50 G. into a dyebath which contains in 4000 parts of water 1 part of the cobaltiferous dyestufi obtainable as described in the first paragraph of Example 1, and parts of crystalline sodium sulfate. 3 parts of acetic acid of 40 per cent strength are added, and the bath is raised to the boil in the course of hour and dyeing is carried on for hour at the boil. The wool is finally rinsed with cold water and dried. There is obtained a brownish yellow dyeing of very good fastness to washing and light.

The same result is obtained when no acetic acid is added to the dyebath.

A brownish yellow dyeing is also obtained when superpolyamide fibers (nylon fibers) are used instead of wool.

What is claimed is:

1. A complex cobalt compound containing two monoazo dyestufis so bound in complex union with a cobalt atom that the proportion of the number of atoms of cobalt bound in complex combination to the number of monoazo dyestufi molecules is smaller than 1:1 and advantageously about 1:2, and in which the two monoazo dyestufis present are free from sulfonic acid and carboxylic acid groups and one of them corresponds to the formula wherein R1 represents a benzene radical bound to the azo linkage in ortho-position relatively to the hydroxyl-group and free from sulfonic acid amide groups, and R2 represents a benzene radical containing a sulfonic acid amide group, the other monoazo dyestufi present in the complex being selected from the group consisting of a monoazo dyestufi which corresponds to the aforesaid formula and an ortho:ortho-dihydroxymonoazo dyestuff of the benzene-azo-fi-naphthol Series.

2.; A complex-7 cobalt, compound containing twd:

monoazo dyestuffs so bound in complexmnion with a cobalt atom that the proportion of then carboxylic acid groups, contain a single sulfonic "acid amide group, and correspond to the formula wherein Y represents the single sulfonic acid amide grouppresent in the monoazo dyestuif molecule and R1 represents a benzene radical wherein one Y represents a hydrogen atom, the other Y represents the single sulfonic acid amide group present in the monoazo dyestulf molecule and R1 represents a benzene radical containing as sole substituents at least one and at most two substituents selected from the group consisting of a chlorine atom and a nitro group.

4. A complex cobalt compound according to claim 3, wherein both monoazo dyestuffs present have the same constitution.

5. A complex cobalt compound containing two molecules is substantially 1:2, and in which both monoazo dyestuffs present correspond to the formula one atom of cobalt in complex union withsubstantlally two molecules of the monoazo dyestuff of the formula 7. The complexcobalt compound containing one atom of cobalt in complex union with substantially two molecules of the monoazo dyestuff of the formula UNITED STATES PATENTS OH Number Name Date 7 g 1,623,005 Gubler et a1 Mar. 29, 192': 2,104,357 Straub et al. Jan. 4, 1938 S 2 3 2,443,226 1 Carson June 15, 1948 2,610,175 Widmer et al Sept. 9, 1952' I FOREIGN PATENTS Number- Country Date 8. The complex cobalt compound containing 119,901 Switzerland 1927 one atom of cobalt in complex union with substantially two molecules of the inonoaz'o dyestu fi of the formula 1 ARTHUR BUEHLER.

References Cited inthe file of this patent Switzerland Aug. 1, 1929 CHRISTIAN ZICKENDRAHT. 

1. A COMPLEX COBALT COMPOUND CONTAINING TWO MONOAZO DYESTUFFS SO BOUND IN COMPLEX UNION WITH A COBALT ATOM THAT THE PROPORTION OF THE NUMBER OF ATOMS OF COBALT BOUND IN COMPLEX COMBINATION TO THE NUMBER OF MONOAZO DYESTUFF MOLECULES IS SMALLER THAN 1:1 AND ADVANTAGEOUSLY ABOUT 1:2, AND IN WHICH THE TWO MONOAZO DYESTUFFS PRESENT ARE FREE FROM SULFONIC ACID AND CARBOXYLIC ACID GROUPS AND ONE OF THEM CORRESPONDS TO THE FORMULA 